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Title: Nonlinear excitation of the ablative Rayleigh-Taylor instability for all wave numbers

Small-scale perturbations in the ablative Rayleigh-Taylor instability (ARTI) are often neglected because they are linearly stable when their wavelength is shorter than a linear cutoff. Using 2D and 3D numerical simulations, it is shown that linearly stable modes of any wavelength can be destabilized. This instability regime requires finite amplitude initial perturbations and linearly stable ARTI modes are more easily destabilized in 3D than in 2D. In conclusion, it is shown that for conditions found in laser fusion targets, short wavelength ARTI modes are more efficient at driving mixing of ablated material throughout the target since the nonlinear bubble density increases with the wave number and small scale bubbles carry a larger mass flux of mixed material.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. of Science and Technology of China, Hefei (China)
Publication Date:
Report Number(s):
2017-162, 1368
Journal ID: ISSN 2470-0045; PLEEE8; 2017-162, 2324, 1368; TRN: US1801088
Grant/Contract Number:
NA0001944; SC0014318; AC02-06CH11357; 20150568ER
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 97; Journal Issue: 1; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1417637
Alternate Identifier(s):
OSTI ID: 1417077